Table of Contents
Advertisement
NAT Setup
5.2.1 Port Redirection Table
The Port Redirection is for you to expose internal servers to the
public domain. For example, you run a web server and some users
want to access this web server. You also run an internal SMTP mail
server for your home office and you shall allow your ISP to send
whole E-mail to your SMTP mail server. Consequently, you assign
different port number on the Port Redirection Table to different
services such as http, smtp, ftp etc.
External users, i.e. people
elsewhere on the Internet can then access your web server via your
public IP address. Even if your public IP address is a dynamic IP
address, you can apply the Dynamic DNS service to obtain an online
WAN IP address (such as hostnmae.dyndns.org) where is able to be
mapped to your current dynamic IP address. Any external user can
visit your web server simply via your online WAN IP address.
The following example shows how an internal FTP server is exposed
to the public domain. The internal FTP server is running on the local
host addressed as 192.168.1.10.
As shown above, the Port Redirection Table provides10
port-mapping entries for internal hosts.
5-3
Advertisement
Table of Contents
